Cement mill



A. BERGLUND.

CEMENT MILL. APPLICATION FILED JULY 22.1921.

Patented Aug. 22, 1922;

' Z SHEETSSHEET 1.

Inventor. flflzdrew Berglung A. B'ERGLUND.

' CEMENT MILL.

APPLICAT'ON FILED JULY 23,1921- l A26 8 1 2 Patented Aug. 22, 1922.

dImfezlgtor Z d n r8 W e 7 u n was 9 v 4% gm% I ogmrney ANDREEU BEBGLUHD,

BRIDGE, O1? CHICAGO, ILLINOIS.

CEMENT MILL.

Application filed July 23,

T 0 aZZ whom it may concern:

Be it known that I, ANDREW BERGLUND, a citizen of the United States, and a resident of Indiana Harbor, county of Lake, and State of Indiana, have invented certain new and useful improvements in Cement Mills, of which the following is a specifica tion.

This invention relates to improvements in that type of mills or grinding machines employed for finely comminuting the various kinds of material which enter into the composition or manufacture of cement, and it consists in certain peculiarities of the construction, novel arrangement and combination of the parts thereof, as will be hereinafter more fully set forth and specifically claimed.

The principal object of the invention is to provide a mill or grinder of the above mentioned general character, which shall be simple and inexpensive in construction, strong, durable and efficient in operation, with its parts so made, arranged and co operating with one another in such a manner as to cause the mill to handle or reduce to the proper degree of fineness material or materials, in a rough state, or when such material consists of lumps, particles or pieces of different sizes and hardness.

Still another object is the provision of means for the self-adjustment vertically of the upper grinder of the mill, to the end that the machine will not become clogged by reason of two large or unbreakable pieces of material being fed to the space between the upper and nether or lower grinder A still further object is to furnish grinders of the machine whichshall be of novel construction and highly eiiicient in action or operation.

In the accompanying drawings, which serve to illustrate an embodiment of the invention v Fig. l is a view partly in vertical sec." tion and partly in elevation of the mill, feeding mechanism, and a portion of the discharging conveyer.

Fig. 2 is a plan view partly in elevation and partly in section taken on line 22 of Fig. 1, looking in the direction indicated by the arrows.

Fig. 3 is a plan view partly in section and partly in elevation taken on line 33 of Fig. 1 as indicated by the arrows.

Specification of Letters Patent.

Patented A11 22, 1922.

1921. Serial No. 486,927.

Likenumerals of reference refer to corresponding parts throughout the different views of the drawings.

Referring now more particularly to Fig. 1 of the drawings, the reference nun'ieral l2 designates the casing of the mill or grinder, which is by preference cylindrii'ral in shape and made of'strong and durable metal. This casing is supporteo at a suitable distance from the floor, ground, or other horizontal support on which it may be mounted, by means of upwardly extended legs 13, a pair of which are located substantially diametrically to another pair of such legs as will be readily understood by reference to Fig. 3 of the drawing. in this last mentioned View, as well as by reference to Fig. l of the drawing, it will be understood that the legs 13 are downwardly extended continuations of curved metal straps 1 1, which are secured to the lower portion of the casing 12 on the outer surface thereof by means of rivets or bolts. Extended diametrically and horizontally across the casing 12 is a supporting bar 15 for the bearing of the lower end of the drive shaft 16, which is centrally and vertically mounted in the casing.

The supporting bar 15 rests at its ends on angle brackets 17 secured to the inner surface of the lower portion of the casing 12 dianiietrically opposite each other. The bearing for the lower end of the driving shaft 16 consists of a hollow cylindrical block 18 which has on its lower portion an annular flange 19 provided with openings for the reception of bolts'or rivets 20 used for securing said flange to the upper surface of the supporting bar 15. As shown in Fig. 1 of the drawings, the cavity or socket of the block 18 is provided in its wall With an annular race-way 21 for the reception of a series of anti-friction balls 22, and also that the bottom of the cavity or socket of the block 18, is provided with a circular race-way 23, in which is located a series of anti-friction balls 24 on which the lower end of the driving shaft 16 will rest. By this construction, it is evident that the balls 22 in the race-way 21 will serve to reduce friction between the shaft 16 and the block 18 incident to the rotary movement of said shaft, while the balls 24 will serve to reduce friction incident to the weight of the shaft 16 and the load which it carries.

As shown in Fig. 1, the shaft 16 extends upwardly through the center of the casing "12 for a considerable distance there-above,

. against thehead 2380f its rod.

and is connected by means of a suitable coupling 25 to the shaft 26 of an electric motor 27 which is mounted on an over-head or elevated horizontal support 28, such as the lower surface the floor of an upper room of a building. In this figure, I have also shown the feeding conveyer as being horizontally mounted on a suitable upright support below thefioor 28 or elevated support for the motor, and equipped with a portion 29 of a hopper leading from the upper room of the building of which the floor 28 forms a part. y

In order to properly support the driving); shaft 16 and to hold it'in true vertical alignment with respect to the walls of the casing 12, I employ a number of upwardly and inwardly. extended arms 30 which are secured at their lower ends by means of bolts or rivets 31 to the outer surface of the casing 12 and at their upper ends by means below the coupling 25 which unites it to the motor shaft. The inner surface or wall of the casing 12 is provided with a plurality of vertically disposed guide pieces 36 which as shown in Fig. l extend downwardly from the topof the casing to about its middle. These guide pieces 36 are fixed in any suitable manner to the casing 12, and each has at its upper end an upwardly ezi'- tended reduced portion or rod 37 each of which terminates at its upper end in a head 38 or enlargement. ,These reduced portions 37 of the guide pieces36 are loosely e:-: tended through suitable openings in the top plate or cover 39 of the casing.

Surrounding each of the rods or reducedv portions'37 is a spiral sprinp; 4E0 which rests at one of its ends against the upper surface: or the cover 39 and at its other end The cover or lid 39 is providedfwith an opening; ll for the reception of the driving shaft and.

a portion of the feedingchute as will be presently explained. This plate is also pro vided with a plurallty of vertically disposed screw-threaded openings 42 which are preferably located near the guide pieces 36; and inwardly of the same as will be readily understood by reference to Fig. 1 of the drawings. In each of the screw-threaded openings 42 of the cover-39 is located in screw engagement therewith a screw-bolt 4C3, each of which has on its lower end an enlargement or head 45, and each has its.

upper end formed angular in cross-section for the convenience of being engaged by a wrench used forturning said screw-bolts for the adjustment. thereof when requh'ed.

As shown in Fig. 1, each of the heads :5 on each of the screw-bolts 43, is located in an inverted cup-shaped casing l6, each of which is bolted to a plate a? secured by means of bolts or rivets 48 to the upper surface of the upper grinder, which is designated as a whole by the reference numeral 49 and is of a corresponding shape to the cross-sectional shape of the casing- 12 in which it is snugly fitted or mounted for vertical movement. At proper points to engage the guide piecesSG, the grinder 49 is provided with vertically nisposed guideways 50, which arrangement will permit of the vertical movement of said grinder. Located within each of the casings 4.6 and around each 01": the bolts 43 therein, is a coiled spring 51 one end of which rests against the head 4-5 of its boltand the other against the lower or inner surface of the top of the casing 46. Each of the screw" bolts 43 has fixed thereon between the cas-- ing cover 39 and the plate 4:? f the upper grinder 49 a gear or sprocket wheel 52 around which is extendedv a sprocket chain 53. By this arrangement it is apparent that by turning one of the screw-bolts 43 in the proper direction the other of said bolts, by reason of their connections with one another through the instrumentality of the sprocket chain and gears, will. be turned in thev same direction, thus affording means for regulating thev tension of the support ing springs 51 in the casings 46 on the plate 47 of the upper grinder.

' As the bolts 43 are in screw engagement with the openings 4-2 in the lid39 of the casing, it is manifest that in the upward movement of the upper grinder 419, saidllid or cover will be forced a ainst the tension of the springs 40, which will normally hold terial receiving opening 54- which. is slightly enlarged downwardly as is clearly shown in 1 of the drawings. The upper end of this opening 54 registers with an opening in a circular and outwardly flared hopper 55 which is mounted around the driving; shaft 16 and is secured at its lower end to the upper surface of the plate t? on the upper end of the upper grinder.

The lower surface of this grinder is outwardly and downwardly beveled as at 56, to permit of the passage of material between the lower end of thegrinder 49 and'the upper end of the lower grinder 57, which is solid and cylindrical in shape but of less diameter than the casing 12 for the purpose of forming an annular and vertical passageway 58 between its periphery and the wall of the casing. The lower grinder 57 is provided with a vertically disposed central opening fort-he driving shaft 16, and is keyed or otherwise fixed to said shaft so as to rotate therewith. Each of the grinders 49 and 57 is composed of a body of zinc or other soft 'metal 59 surrounded by a metal band 60 and a plurality of vertically disposed and spaced steel bars 61 imbedded in the zinc or soft metal bodies with their ends, especially their adjacent ends, exposed through said material. Directly below the opening 5 in the upper grinder a9, that portion of the lower grinder-'57 is without the steel bars, as shown in Figs. 1 and 3, for the reason they would be practically useless if employed at this point. By reference to Fig. 3 of the drawings, it will be clearly seen that the bars of the outer circle thereof are spaced a less distance apart than the bars of the concentric circles thereof inwardly of the outer circle. This arrangement is an advantageous one, for the reason in the rotation of the grinder and in the operation of grinding the material between the two grinders, the material will travel towards the periphery of the grinders in labyrinthian passageways produced by the spaced bars and spaced concentric circles thereof. In this passage and operation, the material will be finely comminuted but as the bars in the outer circle thereof are more closely spaced than the circles of bars inwardly thereof, it is manifest that particles which may have passed between the bars of the circles thereof inwardly of the outer circle, will be retarded by the bars of the outer circle until they are finely comminuted or powdered.

Horizontally mounted on a vertical support 62 below the elevated support or floor 28 is the feeding conveyer of the machine, which conveyer is designated as a whole by the numeral 63, and consists of a pair of spaced and parallel side-pieces 64c, see l of the drawings. These side-pieces are connected together by means of a pair of horizontally disposed shafts 66 and 67, which are by preference journaled at their ends in horizontally disposed brace or supporting bars 68 supported by the upright 62. The shaft 67 has mounted thereon a pulley 69 to which power may be applied by means of a belt, not shown, connected to a source of power for driving said shaft.

Each of the shafts66 and 67 has mounted thereon between the side walls 6a of the conveyer a pair of sprocket wheels 70 and 71 respectively, over which is extended an endless conveyer or belt 72 having sprocket chains 73 to engage said wheels. This enclless belt or conveyer 72 is provided transversely thereof with spaced bars 74 for the purpose of furnishing pockets therebetween for the reception of material fed into the conveyer casing through the chute or hopper 29 leading from an upper room of the build ingin which the grinder is located. The side-pieces 6a of the feeding conveyer 63 are further held or braced in spaced relation by means of the hopper chute 29, which is ronnected at its lower end thereto, as well as by a plate 73 secured one of its ends to the lower portion of the hopper 29, and at its other end to the sides ea by means of brackets 7a mounted on said sides at the rear of the above'named hopper.

in front of the hopper 29, a baffle plate 75 is transversely mounted above the sidepieces 64 of ti conveyer on springs 76 secured at their lower ends to the side pieces and their up er ends to said plate. This plate 7 5 is employed to prevent accidental discharge from the conveyer of the material deposited in the pockets between the members 74 on the endless belt or conveyer. Located below the feeding conveyer 63 and extended forwardly and downwardly therefrom is a chute 7 7 which is supported at its upper or rear portion by bars 78 secured to and depending from the brace bars 68 of the feeding conveyer.

As shown in Figs. 1 and 2 of the draw ings, the lower end of this chute 77 is an tended through the opening 41 in the cover 39 of the casing and into the hopper 55 which surrounds the driving shaft 16 and is mounted on the top plate 47 of the upper grinder. In front of the front end of the feeding conveyer 63, the chute 77 is provided with an upwardly extended and rearwardly open hood 7 9 employed to catch and guide the material as it is discharged from the feeding conveyer 63 into the chute 77.

In the operation it will be understood that the body of the feeding charge of the material will pass through the chute 77 to the grinder. The lower grinder 57 is rotated by the motor 27 at a high degree of speed, which will cause the material lying on the upper surface of said grinder to move towards the periphery thereof and between the lower surface of the upper grinder and the upper surface of the lower grinder, in which operation the material will be crushed and finely pulverized or comminuted, after which it will pass through the space 58 between the periphery of the lower grinder and the wall of the casing, and fall onto the discharging conveyer 96 which is in the form of an endless belt and is extended over suitable rollers 97, one of which only is shown, transversely journaled below the casing. The discharging conveyer 96 may be operated by any suitable means applied to one of the shafts 98 of said rollers.

in the operation of grinding the material, large or refractory lumps will be caused to pass between the adjacent surfaces of the grinders, and to provide means for preventing such lumps or pieces clogging the machine, the upper grinder is mounted for vertical movement, and by reason of this arrangement, it is apparent that when refractory or large lumps or pieces of material are encountered, the upper grinder will be permitted to move upwardly against the tension of the springs 40 and 51, which normally hold the cover 39 of the casing and the heads d5 of the screw-bolts 43 in their lower-most positions as shown in Fig. 1 of the drawings.

Having thus fully described my invention, What I claim as new and desire to secure by Letters Patent is l. A grinder for a cement mill consisting of a cylindrical body of soft material having longitudinally imbedded therein spaced and relatively thick steel bars exposed through one of the opposed ends of said body, said bars being arranged in having longitudinally imbedded therein spaced and relatively thick steel bars. exposed through one of the-opposed ends of said body, said bars being arranged in spaced concentric circles with respect to the axis of the body of the grinder and in spaced staggered relation to one another diametrically of said body the outer circle oi said bars being more closely spaced than the bars of the inner circles.

ANDREW BERGLUND; 

